Method of assembling a grand piano

Abstract

A method of assembling a grand piano, an outer rim for a grand piano and a manufacturing method thereof, an arm for a grand piano and a fabricating method thereof, and a keyboard musical instrument are provided. The method of assembling a grand piano comprises an outer rim forming step of forming an outer rim, and a part mounting step of mounting to the outer rim, as a base, a plurality of other parts in order to assemble a grand piano. The outer rim of the grand piano is composed of a left flat plate forming a left front linear portion of a grand piano, a right flat plate forming a right front linear portion of the grand piano, and a plurality of arcuate plates mutually having the same radius r, wherein the arcuate plates are joined to connect rear ends of the left flat plate and the right flat plate therethrough to form a curved portion of the grand piano. The arm for a grand piano comprises an arm portion formed in a front end portion of the outer rim and having a predetermined shape matching the arm of the grand piano, and an arm plate 1 having a shape matching the arm portion of the outer rim and fixed to the arm portion. A keyslip of the grand piano is formed with dowels normal to the surface, while the keybed arranged below the outer rim is formed in a front surface thereof with inserting holes for inserting the dowels of the keyslip thereinto. Also, a receiving fitting is arranged in the inserting hole f or sandwiching a dowel when it is inserted thereinto.

What is claimed is: 
     
       1. A method of assembling a grand piano comprising: forming an outer rim of the piano;   mounting a plurality of sound board bases to an inner surface of said outer rim;   mounting a sound board unit including a sound plate to said plurality of sound board bases mounted to said inner surface of said rim; and   performing additional assembling steps to thereby assemble the piano.   
     
     
       2. A method of assembling a grand piano according to claim 1, wherein forming said outer rim comprises: an outer rim member forming step of individually forming a plurality of outer rim members, respectively; and   an outer rim member joining step of joining said plurality of formed outer rim members to each other.   
     
     
       3. A method of assembling a grand piano according to claim 2, wherein said outer rim member forming step comprises an outer rim member painting step of painting said plurality of outer rim members, respectively. 
     
     
       4. A method of assembling a grand piano according to claim 2, wherein said plurality of outer rim members are composed of two flat plates constituting front left and right linear portions of said outer rim and a curved plate constituting a remaining portion of said outer rim. 
     
     
       5. A method of assembling a grand piano according to claim 1, wherein a predetermined incline is previously formed on each top surface of said sound board bases, so that said sound board unit is fixed to said sound board bases in a state in which said sound plate is carried on said incline. 
     
     
       6. A method of assembling a grand piano according to claim 1, wherein a reinforcing material is attached on an inner surface of said outer rim. 
     
     
       7. A method of assembling a grand piano according to claim 1, wherein said sound plate of said sound board unit is made of plywood. 
     
     
       8. A method of assembling a grand piano according to claim 1, wherein said sound board unit comprises a bridge and a sound rib mounted on front and rear surfaces of said sound plate, respectively, and said bridge has undergone recess formation and string definition. 
     
     
       9. A method of assembling a grand piano according to claim 1, wherein said additional assembling steps comprise fixing a plate unit including a plate to said sound board unit in a state in which said plate is carried on said sound board unit after mounting said sound board unit. 
     
     
       10. A method of assembling a grand piano according to claim 9, wherein said plate unit comprises a pin block directly mounted to said plate. 
     
     
       11. A method of assembling a grand piano according to claim 10, wherein a tuning pin is embedded in said pin block of said plate unit. 
     
     
       12. A method of assembling a grand piano according to claim 9, comprising adjusting a bridge height by adjusting a vertical relative distance of said plate to said sound plate by way of a nose bolt. 
     
     
       13. A method of assembling a grand piano according to claim 9, wherein said additional assembling steps comprise stretching strings in said plate, subsequently fixing a keybed base to an inner surface of said outer rim, and mounting a keybed unit including a keybed to said outer rim through said keybed base after fixing said plate unit to said sound board unit. 
     
     
       14. A method of assembling a grand piano according to claim 13, wherein said keybed base and said sound board bases are mounted at respective predetermined height positions based on the same height reference position of said outer rim. 
     
     
       15. A method of assembling a grand piano according to claim 14, wherein said height reference position is set at a top surface of said outer rim, and said keybed is arranged between inner surfaces of said outer rim. 
     
     
       16. A method of assembling a grand piano according to claim 13, wherein said keybed unit comprises a damper unit mounted to said keybed. 
     
     
       17. A method of assembling a grand piano according to claim 13, wherein said keybed unit comprises a keyframe carried on said keybed, a keyboard mounted on said keyframe, an action, and a hammer head. 
     
     
       18. A method of assembling a grand piano according to claim 13, wherein said additional assembling steps further comprise a keyboard unit mounting step of mounting a keyboard unit including a keyboard to said keybed after mounting said keybed unit. 
     
     
       19. A method of assembling a grand piano according to claim 18, wherein said keybed unit comprises a keyframe carried on said keybed, a keyboard mounted on said keyframe, an action, and a hammer head.